There's a black area everytime I capture my screen. All screen capture software that I use has this problem. i used Irfanview, FastStone and plain PrintScreen button yield the same result.

Yes, i know i can just crop out the area. but the quality of the screen capture is too bad if i crop it.

not sure this is caused by the update or not. anybody faced this problem before?

Set the output of the capture image format to PNG, not JPEG as JPEG is subject to lossy compression, which sacrificing the quality for lower file size.
So you can edit the image however you want as long as you don't save as jpeg as project/backup.

But Jpeg also can be losslessly cropped by using IrfanView, via JPEG Lossless transformation plugin(lossless rotation,cropping).

not much difference with png with 0 compressions.